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Re: [EnergyPlus_Support] Re: Vertical Ground Heat Exchanger



We don't mean internal bypasses inside the GLHE or GSHP models, but actual bypass pipes inside your EnergyPlus model.  Between any mixer and splitter in a plant loop, you are likely to find a bypass pipe in any of the E+ example files.  

Edwin

On Mon, Jan 10, 2011 at 08:20, urbantomc <urbantomc@xxxxxxxxx> wrote:
 



Brent and Edwin thank you very much for assistence.

It seems logical that bypass is used in the case of GLHE. But why is
there no description of bypass usage then? Neither in the EPlus
manual,nor in Murugappan's thesis on implementation of GSHP and GLHE
models in EPlus environment.

Urban



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Edwin Lee <leeed2001@...> wrote:
>
> Urban:
>
> 1. Check all the node mass flow rates around the loop on both demand and
> supply sides. You should be able to see an overall mass balance in the
> system and that will help identify where the rest of the flow is going
> (likely down a bypass pipe as Brent stated).
>
> Edwin
>
> On Tue, Jan 4, 2011 at 18:02, Griffith, Brent <brent.griffith@...>wrote:

>
> >
> >
> > 1. I'd guess there is one or more bypass pipes that get some of the
> > flow and explain why they aren't the same.
> >
> > 2. That heat transfer is driven by the operation of the plant
> > equipment inside the building and that has not changed with a different
> > borehole field. You should see some significant differences in loop
> > operating temperatures, but not necessarily that heat transfer rate because
> > nothing much has changed on the demand side of the loop.
> >
> >
> >
> > *From:* EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:
> > EnergyPlus_Support@xxxxxxxxxxxxxxx] *On Behalf Of *urbantomc
> > *Sent:* Tuesday, January 04, 2011 3:35 PM
> > *To:* EnergyPlus_Support@xxxxxxxxxxxxxxx
> > *Subject:* [EnergyPlus_Support] Vertical Ground Heat Exchanger
> >
> >
> >
> >
> >
> > Hi everyone.
> >
> > I have some questions regarding vertical ground heat exchangers.
> >
> > 1. Why is the mass flow in the vertical GHE different from the water
> > mass flow at the source side of the heat pump? Shouldn't they be the same?
> >
> > 2. When I've simulated vertical GHE with borehole configuration of 1×2 and
> > then of 4×4 (same depths) for the same building, the output parameter
> > 'VERTICAL GROUND HEAT EXCHANGER:Ground Heat Exchanger Heat
> > Transfer[W](Hourly)'
> > showed approximately the same values. Why is that so? Does that output
> > parameter mean the heat transfer of a single borehole?
> >
> > Any help would be really appreciated.
> >
> > Regards,
> >
> > Urban
> >
> >
> >
>




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